Answer: 
Along with other reasons, the achievement gap among students exists mainly because the educators expect less of minority or low-income children. 
Explanation: 
- It is critical for achieving something substantial that there is an ample availability of resources, guidance, and motivation. 
- In most cases with students, the crude expectations that the educators keep from the students motivate the students to do better at academics and other allied activities. 
- Thus, expecting less from the students can cause the students to exhibit an achievement gap.